有机物料改良紫色土对越橘生长发育的影响
Effects of Organic Material-Improved Purple Soil on the Growth and Development of Blueberry

以低需冷量越橘栽培品种Misty为试料，研究了不同添加量的椰糠、腐叶和油菜秸秆改良紫色土对越橘生长发育的影响.通过对越橘植株的生长和生理指标的测定，利用主成分分析法来进行综合评价分析，探讨3种有机物料改良紫色土的可行性，筛选出改良效果佳的有机物料种类和添加比例.研究结果表明：不同有机物料对促进越橘植株生长贡献量由大到小顺序为椰糠、油菜秸秆、腐叶，在紫色土中添加一定量的椰糠和油菜秸秆，可以有效降低土壤pH，增加土壤孔隙度，增进土壤肥力和持水能力，促进越橘植株和叶片生长.因此，椰糠和油菜秸秆可以作有机物料改良紫色土栽培越橘，当椰糠和油菜秸秆与紫色土体积比分别为2：3和1：4时，越橘的生长发育综合表现最好，改良效果最佳.
'Misty', a blueberry cultivar with low chilling requirement, was used as the experiment material to study the effects of application of coir dust, rot leaves and/or rapeseed straw at different rates to purple soil on the growth and development of blueberry. The growth and physiological indexes of the blueberry plants were determined, and principal component analysis was employed to evaluate the feasibility of improving purple soil with the above-mentioned organic materials and to screen out the types and proportion of the organic materials. The results showed that the contribution of the three organic materials to promoting blueberry plant growth was in the order of coir dust > rapeseed straw > rot leaves. Adding an appropriate amount of coir dust and rapeseed straw to the purple soil effectively reduced soil pH, and increased soil porosity, fertility and water capacity, thus promoting the growth of blueberry plants and leaves. A ratio (v/v) of 2:3 of coir dust to purple soil or 1:4 of rapeseed straw to purple soil gave the best soil improvement and the blueberry plants on it grew and developed best